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CentOS vs. Oracle vs. Scientific Linux 6.1 Performance

" While CentOS, Scientific Linux, and Oracle Linux Server are
all derived from the same upstream source (Red Hat Enterprise
Linux), how does the system performance compare between these RHEL
derivatives

After doing some Oracle Linux Server 6.1 testing over the
weekend, I proceeded to install the recently released CentOS 6.1
and then Scientific Linux 6.1 to see how the performance of these
Linux operating systems based upon Red Hat Enterprise Linux 6.1
compare in terms of performance. To some surprise, there are some
noticeable performance differences in some tests.